@article{10_4171_dm_252,
     author = {Ciro Ciliberto and Gerard van der Geer},
     title = {Andreotti-Mayer loci and the {Schottky} problem},
     journal = {Documenta mathematica},
     pages = {453--504},
     year = {2008},
     volume = {13},
     doi = {10.4171/dm/252},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/252/}
}